ع
Trees

Arabic Name

البلوط الحريري

Latin Name

Grevillea robusta , Proteaceae

English Name

Grevillea, Silk Oak

The Silk Oak is a strong, enduring tree that reaches a maximum height of 50 metres. However, such growth can be expected only in its native country, Australia. Although it grows quite fast, it will usually not exceed 13 metres, especially in Arriyadh. The tree has a conical, upright form. Fern-like, lacy leaves are shiny green on top and silvery below, while the showy orange flowers are borne in large clusters on the branches, usually when the tree is in a semi-deciduous state after the winter. Silk Oaks are considered evergreen, but foliage may be shed owing to cold, or when the new leaves appear. It will tolerate a wide variety of soils, but these should be well drained. Waterlogging and alkaline desert soils limit the speed of growth and cause iron chlorosis. The wood is brittle and wind exposure may cause branches to die back or break off. Propagation is by seed or cuttings. G. robusta is a background tree for use in parks and in public squares. A mature tree makes a picturesque silhouette against the sky. Heavy pruning is possible, but may spoil the columnar or pyramidal shape. It has toxic qualities. Grevilleas may sometimes cause painful skin irritation. Regular irrigation is necessary at first, but a mature tree is generally drought-resistant and requires a deep soaking every month or so. Heavy leaf litter in spring necessitates a lot of tidying up from lawns and paving, although it can be left as mulch on the soil. This tree is rarely seen in Arriyadh, although it has potential for planting in protected situations.

General information

Family Name : Proteaceae
Origin: Tropical , Mediterranean , Sub Tropical
Rainfall: Semi Humid , Semi Arid
Propagation: Cuttings , Sowing and Pricking Out
Maintenance: Moderate

Environmental conditions

Urban Climate: Vulnerable
Desiccation: Vulnerable
Drought: Vulnerable
Irrigation: Medium
Salinity: Moderate < 3,000 ppm
Hardiness Zones: -6°C

Plant shape

Vigour: Fast Growing
Height: From 13 To 50 M
Expansion: From 7 To 20 M
Foliage: Evergreen

Flower

Colour: Yellow Deep , Orange Deep
Size: From 7 To 10 CM
Flowering Period: From Early March Till Late May

Fruit

Type Of Fruit: Drupe (leathery/fibrous)
Size: 3 CM

Location of Use :

Home Plant , Public Open Space , Pedestrian Precinct , Park Planting , Specimen , Wadi Farm Garden , Urban Area

Other choices :

Attractive Foliage , Plant Used by ADA , Attractive Flower , Crop Plant , Dominant Plant

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